Dual-Zone Vehicle HVAC System with Powered Blower and Heater Core
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Solution Overview
Problem
Existing HVAC systems for vehicles often struggle to provide independent temperature control across multiple zones efficiently, particularly in electric vehicles where traditional engine-heated coolant systems may not be effective, leading to inconsistent heating and cooling in different areas of the vehicle interior.
Innovation Solution
A multi-zone climate control system that includes a front HVAC unit capable of selectively heating and cooling air, a powered blower, and a heater core with a liquid-to-air heat exchanger, which allows for independent temperature control of air flowing to different zones by adjusting the temperature and flow rate of heated liquid and using an air blender to mix cold and heated air, ensuring conditioned air is efficiently distributed to both front and rear zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a traditional engine-heated coolant system is used in electric vehicles, then heating function is provided, but the system is ineffective because electric vehicles lack internal combustion engines
Solution Approach 1:
The patent introduces an electric heater core that converts electrical energy to thermal energy, changing the energy source parameter from mechanical (engine) to electrical. This allows the heating system to function effectively in electric vehicles by replacing the engine-dependent coolant heating mechanism with an electrically-powered heat exchanger.
Solution Approach 2:
The patent replaces the mechanical engine-driven heating system with an electrical heating system. The electric heater core uses electrical resistance heating to warm the coolant, substituting the mechanical energy conversion process of internal combustion engines with an electrical energy conversion process suitable for electric vehicles.
2Device complexity
If a single HVAC unit controls multiple zones, then system complexity is reduced, but independent temperature control across zones is compromised
Solution Approach 1:
The patent divides the HVAC system into separate functional zones with dedicated control mechanisms. Each zone has its own temperature sensor and control valve that can independently regulate airflow and temperature, allowing different temperature settings in different vehicle zones while using a single physical HVAC unit.
Solution Approach 2:
The patent implements zone-specific temperature control by providing each zone with localized sensors and control elements. This allows each zone to have tailored thermal characteristics and independent temperature regulation, enabling different front and rear zones to be heated or cooled to different temperatures based on individual passenger requirements.
3Productivity
If heated liquid flow rate is increased to improve heating efficiency, then more energy is consumed, but temperature control precision is reduced
Solution Approach 1:
The patent employs dynamically adjustable control valves and flow regulators that can continuously modulate the heated liquid flow rate based on real-time temperature sensor feedback. This dynamic control allows the system to optimize heating efficiency by adjusting flow rates to match actual heating demands, preventing both energy waste from excessive flow and insufficient heating from restricted flow.
Solution Approach 2:
The patent implements feedback control systems with temperature sensors in each zone that continuously monitor actual temperatures and adjust heated liquid flow rates accordingly. This closed-loop control ensures precise temperature maintenance while optimizing energy consumption by increasing flow only when and where heating is actually needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables precise and efficient temperature control across multiple zones, ensuring that both front and rear compartments receive conditioned air at desired temperatures, enhancing passenger comfort and reducing energy consumption by optimizing the use of heating and cooling resources.
Implementation Method 1
The heater core includes a liquid-to-air heat exchanger that is fluidly connected to a source of heated liquid to selectively heat cold air entering the heater core
Implementation Method 2
an air blender having a blend door that is configured to selectively mix cold air from the front HVAC unit with air that has been heated by the liquid-to-air heat exchanger to control the temperature of air exiting the heater core
Implementation Method 3
The powered blower is fluidly connected to the cold air outlet, and the powered blower is generally positioned in the center portion
Data Source
AI summary
A multi-zone climate control system for vehicles includes a front HVAC unit, a powered blower, and a heater core. The front HVAC unit is adapted to condition air provided to first and second front zones. The front HVAC unit further includes a cold air outlet connected to the powered blower. Cold air from the cold air outlet of the front HVAC unit passes through the powered blower and enters the heater core. The heater core is configured to control a temperature of conditioned air supplied to at least one rear zone of the passenger compartment.